This is a bridge between Cpg 1.5x & Joomla 1.5x that doesn't require any hack of Coppermine Core file.
Get the files right now; but make sure you read instructions after the link.

Javascript, Please!

1- Install Joomla component

Go to Joomla's backend , and install the component com_coppermine15.zip . Important: Add a direct link to your Coppermine install in your Joomla website menu (example: http://www.mysite.com/cpg/) . Do not link the Coppermine Component! Remark: the component is required by the bridge even if you don't link to it

2- Install & enable bridge
Take the
file joomla15.inc.php , and copy it in the bridge folder of your gallery.

After integration of Coppermine inside your Joomla's Template, you may have noticed some CSS related problems. If you put a second stylesheet named style2.css , inside the folder of your current Coppermine's theme, the bridge will detect the new css stylesheet and use it instead of the default one i.e style.css. Thus, better use a second style2.css to perform all necessary modifications; this way the original file style.css will remain intact and available if you unbridge. The CSS Integrator page allows to perform automatically all essential CSS fix. Just browse and indicate your style.css file, submit, rename the processed file into style2.css, and then put it in your theme folder. Note:style2.css for the Curve theme already provided.